Table of Contents
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SOUNDCRAFT CPS250
CPS275
Console Power Supply
User and Technical Manual
For your own safety and to avoid invalidation of the
warranty all text marked with these Warning
Symbols should be read carefully.
IMPORTANT: please read this manual carefully
before connecting your Soundcraft console power
supply to the mains for the first time.
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Table of Contents
Related Manuals for SoundCraft CPS250
Summary of Contents for SoundCraft CPS250
- Page 1 For your own safety and to avoid invalidation of the warranty all text marked with these Warning Symbols should be read carefully. IMPORTANT: please read this manual carefully before connecting your Soundcraft console power supply to the mains for the first time.
- Page 2 Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. Soundcraft shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual, or through any mis-operation or fault in hardware contained in the product.
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Page 3: Table Of Contents
Table of Contents Introduction Introduction Short-circuit Protection Mains Voltage Selection Replacing Mains Fuse Warranty Recommendations For Installation Recommendations For Installation General Dimensions PSU Linking (CPS275 Only) Technical Specification Technical Description Circuit Diagram (1) Circuit Diagram (2) Circuit Description Servicing PCB Layout Output Pinouts Parts List... -
Page 5: Introduction
Introduction Introduction... -
Page 6: Introduction
The CPS250/CPS275 is designed for installation in a 19" rack unit, occupying 2U of rack height. Refer to the section "RECOMMENDATIONS FOR INSTALLATION"... -
Page 7: Mains Voltage Selection
Check the fuse and replace if necessary; also check that the voltage selection is correct for the mains supply level before switching the unit ON again. In the event of repeated failure of the mains fuse consult the Soundcraft dealer from where the unit was purchased. -
Page 8: Warranty
Equipment has been properly installed in accordance with instructions contained in Soundcraft’s manual; and b) the End User has notified Soundcraft or the Dealer within 14 days of the defect appearing; and c) no persons other than authorised representatives of Soundcraft or the Dealer have effected any replacement of parts maintenance adjustments or repairs to the Equipment;... -
Page 9: Recommendations For Installation
Installation Recommendations For FOR UK USERS ONLY IMPORTANT WARNING THIS APPLIANCE MUST BE EARTHED The wires in the mains lead are coloured in accordance with the following code: Earth Green and Yellow: Neutral Blue: Live Brown: As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: •... -
Page 10: Recommendations For Installation
For the same reason, when rack-mounting it is preferable to avoid locating the unit adjacent to signal processing equipment. It should be noted that if a complete rack containing a CPS250/CPS275 unit is to be operated from a different mains supply level, then the unit should be withdrawn from the rack in order to reselect the mains voltage setting, at the same time as resetting any other equipment. -
Page 11: General
Refer to your Soundcraft dealer for a suitable case. Where the CPS250/CPS275 is enclosed in a touring case, provision must be made for adequate ventilation to the rear of the unit to ensure unrestricted supply of air for the cooling fan. -
Page 12: Dimensions
PSU Linking (CPS275 Only) The output voltages from the CPS275 are fed via diodes as shown in the adjacent diagram. This allows a standby CPS275 to automatically takeover in the event of a power rail failing. When a spare CPS275 is ordered it comes with a 1metre linking cable. -
Page 13: Technical Specification
Technical Specification Technical Specification... - Page 14 Technical Specification MAINS INPUT VOLTAGE RANGE: 85/100/115/230 V AC +10%/-15% @ 50/60Hz RATED INPUT POWER (Max): CPS250 - 350 WATTS CPS275 - 450 WATTS MAINS FUSE RATING: Use T3.15A/250V (slow-blow) for 230V Use T6.3A/250V (slow-blow) for 85/100/115V OUTPUTS DC. VOLTAGE RAIL +17.5V...
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Page 15: Technical Description
Technical Description Servicing should only be carried out by a competent service engineer. SEE THE WARNINGS STARTING ON PAGE 17. Technical Description... -
Page 16: Circuit Diagram
Circuit Diagram (1) Technical Description... - Page 17 Circuit Diagram (2) Technical Description...
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Page 18: Circuit Description
Circuit Description The CPS250 and CPS275 power supplies provide +/-17V at 4 Amps and 5.25 Amps respectively. Both give +5V at 1 Amp, and +48V at 0.3 Amp. The PCB is SC3803. THE +/- 17V RAILS. This consists of two identical +17V supplies connected together to give +/-17V. - Page 19 The constant-current protection system works in the standard way; when an attempt is made to draw excessive current, the output voltage is reduced so that no more than a fixed maximum can be drawn. However, the high current capability of this PSU means that long-term constant-current protection alone is not practical as the dissipation in the pass devices is too high for the cooling system to deal with, and in time they will overheat.
- Page 20 The +5V Supply. Max current rating 1.0 Amps. This supply is primarily intended for powering console internal computers; it also powers the cooling fan. The AC input is fused by F4 and fullwave rectified by D9-12, with C36 as the reservoir capacitor.
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Page 21: Servicing
Servicing SAFETY. These safety notes are directed to those testing and repairing this power supply. Legal requirements mean that we must not encourage untrained personnel to take the lid off. Servicing should only be carried out by a competent service engineer. This supply contains mains voltages on the voltage select PCB, the mains switch, etc, and the usual precautions must be taken. - Page 22 The correct high efficiency mounting pad must be used, and this should be replaced if it appears to be damaged (see the Parts Lists for the relevant Soundcraft Part Numbers). When refixing or replacing the device, it is important to screw the device down before resoldering the pins to avoid stressing the pads on the circuit board.
- Page 23 Reassembly is simply a reverse of the procedure above. Particular care should be taken when fixing the regulators, ensuring that the pins are not bent or the circuit board pads strained when the fixing screws are tightened. The regulator screws are tapped into a relatively soft aluminium heatsink.
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Page 24: Pcb Layout
PCB Layout Technical Description... -
Page 25: Output Pinouts
Output Pinouts Technical Description... - Page 26 Technical Description...